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"We were treated by people who didn't know their jobs, they didn't act quickly enough.

"We should have all been given the option of (stem cell) transplants immediately."

Crown Solicitor Todd Golding QC told the inquest the response to the error was "simply inadequate" but did not recommend findings against any individual.

"The incidents should have been reported promptly on SLS (reporting system)," he said.

"Many of the witnesses gave evidence that they either did not know how to use SLS or didn't have adequate or sufficient training in how to use SLS."

Mr Golding said doctors had since received further training including how to engage in open disclosure in medicine.

In submissions heard last week, counsel assisting the coroner, Naomi Kereru, said the dosing errors were made after a change in protocol.

Ms Kereru said errors were also made after the underdosage, including missed opportunities to correct the mistake and problems with the way the issue was communicated to patients and their families.

Mark Griffin QC, representing some of the affected patients and their families, urged the coroner to recommend that proposed changes to chemotherapy protocols first be discussed with clinicians and allied health practitioners.

Mr Griffin also urged the coroner to make findings against six doctors involved in the dosing errors.